MAY 1, 1969 THRU AUG 17, 1971.POSSIBILITY THAT AIR BRAKE PIP ING HAS BEENERRONEOUSLY CONNECTED TO HAND CONTROL VALVE WHICH , WHEN APPLIED, IS TO OPERATESERVICE BRAKES ON REAR AXLE.ER RONEOUS PIPING WILL CAUSE BRAKING TO BE ONFRONT AXLE INSTEADOF REAR AXLE.CONDITION DOES NOT WITH NORMAL FUNCTIONINGOF S ERVICE OR EMERGENCY BRAKE SYSTEMS.(CORRECT BY INSPECTING ANDINSTALLINGPROPER PIPING WHERE PIPING WHERE NECESSARY.)